[BUG?] here documents, command substitution, and the { keyword

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Hi,

Just ran into some strange behavior:

$ cat test.sh
#!/bin/sh
echo hello >greeting
cat <<EOF &&
$(cat greeting)
EOF
{
	echo $?
	cat greeting
} >/dev/null


$ sh test.sh
hello
test.sh: 7: {: not found
127
hello
test.sh: 10: Syntax error: "}" unexpected

bash, mksh, pdksh, and ksh93 all print hello as expected.  The problem
is reproducible with all versions of dash in the git repo.

Ideas?
Jonathan
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